Broadcasting receiver

Abstract

A broadcasting receiver includes a demodulator, a detector, and a start flag storage unit. The demodulator demodulates received digital broadcasting and outputs a demodulated signal. The signal detector detects a synchronization signal and a start control signal from the demodulated signal. The synchronization signal and the start control signal are contained in an emergency alert broadcasting frame multiplexed onto the digital broadcasting. The start control signal indicates emergency alert broadcasting. The start flag storage unit stores a start flag indicating that the signal detector has detected the start control signal.

1 . A broadcasting receiver, comprising:
 a demodulator to demodulate received digital broadcasting and to output a demodulated signal;   a signal detector to detect a synchronization signal and a start control signal from the demodulated signal, the synchronization signal and the start control signal contained in an emergency alert broadcasting frame multiplexed onto the digital broadcasting, the start control signal indicating emergency alert broadcasting; and   a start flag storage unit to store a start flag indicating that the signal detector has detected the start control signal.   
     
     
         2 . The broadcasting receiver of  claim 1 , further comprising:
 an error correction unit to obtain emergency alert broadcasting data contained in the emergency alert broadcasting frame through the signal detector and to perform error correction processing on the emergency alert broadcasting data;   a data storage unit to store the emergency alert broadcasting data having been error-corrected on the basis of error detection by the error correction unit; and   an error flag storage unit to store an error flag based on the error detection by the error correction unit.   
     
     
         3 . The broadcasting receiver of  claim 2 , further comprising:
 a match detector to compare emergency alert broadcasting data outputted from the error correction unit with emergency alert broadcasting data outputted from the data storage unit, and to detect whether or not the emergency alert broadcasting data has been updated; and   an update flag storage unit to store an update flag indicating whether or not the match detector has detected updating of the emergency alert broadcasting data.   
     
     
         4 . The broadcasting receiver of  claim 1 , further comprising:
 a decoder to output a transport stream by decoding the demodulated signal outputted from the demodulator; and   a multiplexer to multiplex the emergency alert broadcasting data outputted from the data storage unit onto the transport stream from the decoder to obtain a multiplexed data, and to output the multiplexed data, when the signal detector has detected the start control signal.   
     
     
         5 . The broadcasting receiver of  claim 1  further comprising:
 a controller capable of accessing the start flag storage unit, the controller configured to automatically bring a device to present the emergency alert broadcasting, into an operational state when the start flag indicates that the emergency alert broadcasting is being transmitted.   
     
     
         6 . A broadcasting receiver, comprising:
 a demodulator to demodulate digital broadcasting and to output a demodulated signal;   a signal detector to detect a synchronization signal and a start control signal from the demodulated signal, the synchronization signal and the start control signal contained in an emergency alert broadcasting frame multiplexed onto the digital broadcasting, the start control signal indicating emergency alert broadcasting;   a start flag storage unit to store a start flag indicating that the start control signal has been detected;   an error correction unit to perform error detection and correction of the emergency alert broadcasting data contained in the emergency alert broadcasting frame received through the signal detector;   a data storage unit to store the emergency alert broadcasting data having been error-corrected on the basis of error detection by the error correction unit; and   a controller to multiplex the emergency alert broadcasting data, read from the data storage unit, onto the demodulated signal to obtain a multiplexed data, and to output the multiplexed data, when reading the start flag from the start flag storage unit.   
     
     
         7 . The broadcasting receiver of  claim 6 , wherein
 the controller
 automatically powers on a circuit immediately after reading the start flag, the circuit forming a broadcast receiving unit having a main power source turned off when the start flag is read, and 
 stops power supply to the circuit forming the broadcast receiving unit when the error correction circuit detects an error of the emergency alert broadcasting data. 
   
     
     
         8 . The broadcasting receiver of  claim 6 , further comprising:
 a match detector to compare emergency alert broadcasting data outputted from the error correction unit with emergency alert broadcasting data outputted from the data storage unit, and to detect whether or not the emergency alert broadcasting data has been updated; and   an update flag storage unit to store an update flag indicating that the emergency alert broadcast data has been updated,   wherein the controller reads emergency alert broadcasting data stored in the data storage unit, at timing when the controller reads the update flag from the update flag storage unit.   
     
     
         9 . The broadcasting receiver of  claim 6 , further comprising:
 a decoder to output a transport stream by decoding the demodulated signal from the demodulator; and   a multiplexer to multiplex the emergency alert broadcasting data read from the data storage unit onto the transport stream from the decoder to obtain the multiplexed data, and to output the multiplexed data, when the signal detector reads the start flag.   
     
     
         10 . A broadcasting receiver, comprising:
 a signal detector to detect a synchronization signal and a start control signal from a signal obtained by demodulating digital broadcasting, the synchronization signal and the start control signal contained in an emergency alert broadcasting frame multiplexed onto the digital broadcasting, the start control signal indicating emergency alert broadcasting;   a start flag storage unit readable from an external unit, the start flag storage unit configured to store a start flag indicating that the start control signal has been detected;   an error correction unit to perform error detection and correction of the emergency alert broadcasting data contained in the emergency alert broadcasting frame received through the signal detector; and   a data storage unit readable from an external unit, the data storage unit configured to store the emergency alert broadcasting data having been error-corrected on the basis of error detection by the error correction unit.   
     
     
         11 . The broadcasting receiver of  claim 10 , further comprising:
 a match detector to compare emergency alert broadcasting data outputted from the error correction unit with emergency alert broadcasting data outputted from the data storage unit, and to detect whether or not the emergency alert broadcasting data has been updated; and   an update flag storage unit readable from an external unit, the update flag storage configured to store an update flag indicating that the emergency alert broadcasting data has been updated.